As long as the ball is on the Usbc approved balls list, its is approved for competition and for the USBC tournament.
But the acceptance of these balls is at the discretion of the tournament director and/or league official, so you have to watch out and better check with them first.
The PBA rules state that a bowler cannot use an international ball in any PBA event if they are a citizen of the United States. Only international players competing in a PBA event are excluded from this rule
http://usbcongress.http.internapcdn....d_balllist.pdf
Pba rule
9.2.4 Use of International Bowling Balls. International bowling balls are defined as bowling balls that are not available for purchase within the United States and may be used provided that:
a. The bowler is not a United States resident.
b. The bowling ball was manufactured by a PBA registered company and has an equivalent bowling ball available within the United States.
c. The bowler has received written approval prior to using any international bowling ball in PBA competition.
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